Disease attacking bats on the move April 24, 2014 (AP story and video)

MAMMOTH CAVE, Ky. (AP) — A sign posted at Mammoth Cave National Park in south-central Kentucky lets visitors know if they tour the largest known cave system in the world, they will have to walk on bio-security mats immediately afterward. Shoes must be scrubbed to help contain the spread of a disease that has killed more than 6 million cave-dwelling bats in the United States.
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AP photo by Alex Sanz